<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
        <button @click="add">新增一个数据</button>
        <div v-if="isShow">
            <button @click="ad">新增一个数据</button>
            {{ msg}}
        </div>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.13/dist/vue.js"></script>
    <script>
        var vm=new Vue({
            el:"#app",
            data:{
                isShow:false,
                msg:''
            },
            methods:{
                add(){
                    this.msg="你好 某某"
                    this.isShow=true
                },
                ad(){
                    this.msg="你好 我是谁"
                }
            }
        })
    </script>
</body>
</html>